161813552836608 has 130 divisors (see below), whose sum is σ = 483383947284524. Its totient is φ = 53937850834944.

The previous prime is 161813552836577. The next prime is 161813552836627. The reversal of 161813552836608 is 806638255318161.

161813552836608 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 13 + 5 + 5 + 2 + 8 + 3 + 6 + 608 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 243527866 + ... + 244191417.

Almost surely, 2^{161813552836608} is an apocalyptic number.

161813552836608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161813552836608 is an abundant number, since it is smaller than the sum of its proper divisors (321570394447916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161813552836608 is an frugal number, since it uses more digits than its factorization.

161813552836608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487719319 (or 487719288 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 161813552836608 in words is "one hundred sixty-one trillion, eight hundred thirteen billion, five hundred fifty-two million, eight hundred thirty-six thousand, six hundred eight".